NASA's New Horizons spacecraft is nearly two decades old. Is that a problem?

New Horizons' look at Pluto’s Charon-facing hemisphere reveals intriguing geologic details that are of keen interest to mission scientists. This image was taken on July 11, 2015, when the spacecraft was 4 million km from Pluto.
NASA/JHUAPL/SWRIJuly 13, 2015